A man covers 1/4th of a distance with the speed of 25 km/hr and 50% of the distance covers with the speed of 10 km/hr and the rest of the distance covers with the speed of 12.5 km/hr. What is the average speed of the man in the whole journey?
1
10.5 km/hr
2
20.5 km/hr
3
15 km/hr
4
12.5 km/hr